How to Strip Newline Characters from a String in Golang

strip_newline.go

package main

import (
        "fmt"
        "strings"
)

func main() {

        var string_a string = "My super \nsweet \nstring has \nmany newline\n characters"

        fmt.Println(string_a)

        var string_b string = string_a

        string_b = strings.Replace(string_b, "\n", "", -1)

        fmt.Println(string_b)
}

There's also strings.TrimSuffix(string_b, "\r\n").

In my case tough, can't seem to trim the newline at the end of command output from cat on a file.